FUTONICS F-THETA LENSES
In addition to the industrial fiber laser systems, Futonics offers various F-Theta lenses for 2 µm lasers that can be purchased separately.
The new Futonics product line of F-theta lenses is based on crystal lenses made of zinc selenide and calcium fluoride. Effective focal lengths of 170 mm and 345 mm are available.
High-performance applications at a wavelength of 2 µm require absorption-free lens materials. Most quartz materials absorb due to intrinsic OH molecules at a wavelength of 2 µm. At several hundred watts of laser power, this residual absorption heats the lens and causes at least a distortion of the front heat waves. In extreme cases, the material even tears. Not so with the F-Theta lenses from Futonics.
|Specifications||F-TO 170/2000||F-TO 345/2000|
|Design wavelength||1940-2050 nm||1940-2050 nm|
|Effective focal length||170,2 mm||344,8 mm|
|Max. Inlet diameter||10 mm||20 mm|
|Optical scanning angle||±22°||±24°|
|Working distance||198,7 mm||316,7 mm|
|Scanning area *||90 mm x 90 mm||205 mm x 205 mm|
|Lens material||ZnSe, CaF2||ZnSe, CaF2|
|Spot diameter focus||47,6 µm||88,6 µm|
* For a system with two mirrors with mirror distances from the lens housing: 19.7 mm / 35.7 mm